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Investment in Leasing Operations: Credit Losses (Details) - USD ($)
 3 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Dec. 28, 2019
Activity in the allowance for credit losses for leasing operations      
Balance at beginning of period $ 580,600 $ 861,200  
Provision for credit losses 615,400 10,100  
Recoveries 1,500 4,200  
Deductions for amounts written-off   (224,100)  
Balance at end of period 1,197,500 $ 651,400  
Investment In Leases      
Total investment in direct financing and sales-type leases 22,526,300   $ 25,657,400
Allowance for Credit Losses      
Total 1,197,500   580,600
Investment in leases      
Investment In Leases      
Collectively evaluated for loss potential 22,526,300   25,657,400
Total investment in direct financing and sales-type leases 22,526,300   25,657,400
Allowance for Credit Losses      
Collectively evaluated for loss potential 1,197,500   580,600
Total $ 1,197,500   $ 580,600